LOCATION LASALLE TX

Established Series
DA-CLG-WJG-GWH
11/2010

LASALLE SERIES

The Lasalle series consists of very deep, moderately well drained, very slowly permeable, soils that formed in calcareous, saline, clayey residuum. These nearly level to gently sloping soils are on interfluves of inland, dissected coastal plains. Slopes range from 0 to 3 percent.

TAXONOMIC CLASS: Fine, smectitic, hyperthermic Sodic Haplusterts

TYPICAL PEDON: Lasalle clay in rangeland; elevation is 103 meters (338 feet). (Colors are for dry soil unless otherwise stated.)

A--0 to 13 cm (0 to 5 in); brown (7.5YR 5/2) clay, brown (7.5YR 4/2) moist; moderate fine and medium angular blocky structure; very hard, very firm; many very fine and fine roots; few snail shell fragments; electrical conductivity is 0.9 ds/m; strongly effervescent; moderately alkaline; clear smooth boundary. (Thickness is 10 to 46 cm [4 to 18 in].)

ABnz--13 to 61 cm (5 to 24 in); brown (7.5YR 5/2) clay, brown (7.5YR 4/2) moist; moderate fine and medium angular blocky structure; extremely hard, very firm; common very fine and fine roots; few snail shell fragments; electrical conductivity is 6.5 ds/m; exchangeable sodium percentage is 20; strongly effervescent; moderately alkaline; gradual wavy boundary. (Thickness is 20 to 56 cm [8 to 22 in].)

Bnyssz1--61 to 107 cm (24 to 42 in); light reddish brown (5YR 6/3) clay, reddish brown (5YR 5/3) moist; common fine faint brown (7.5YR 5/2) streaks; moderate fine and medium angular blocky structure; extremely hard, very firm; few very fine and fine roots; few intersecting slickensides; few snail shell fragments; few fine irregular threads of gypsum and other salts; electrical conductivity is 11 ds/m; strongly effervescent; moderately alkaline; diffuse wavy boundary. (Thickness is 15 to 61 cm [6 to 24 in].)

Bnyssz2--107 to 147 cm (42 to 58 in); light reddish brown (5YR 6/3) clay, reddish brown (5YR 5/3) moist; common fine faint brown (7.5YR 5/2) streaks moderate fine and medium angular blocky structure; extremely hard, very firm; few very fine roots; few intersecting slickensides; few fine irregular threads, and medium irregular clusters of crystals of gypsum and other salts; electrical conductivity is 12 ds/m; strongly effervescent; moderately alkaline; diffuse wavy boundary. (Thickness is 0 to 61 cm [0 to 24 in].)

BCnyssz--147 to 183 cm (58 to 72 in); reddish brown (5YR 5/3) clay, reddish brown (5YR 5/3) moist; weak fine and medium angular blocky structure; extremely hard, very firm; few intersecting slickensides; few fine irregular threads and medium irregular clusters of crystals of gypsum and other salts; electrical conductivity is 14 ds/m; strongly effervescent; moderately alkaline.

TYPE LOCATION: La Salle County, Texas; 0.8 mile east of Cotulla on Texas Highway 97; 18.6 miles southeast on Farm Road 624, 0.2 mile west on Hillge Range Headquarters road, 150 feet north in rangeland. Caiman Creek NE, Texas USGS topographic quadrangle; Latitude: 28 degrees, 14 minutes, 22.481 seconds N; Longitude: 99 degrees, 2 minutes, 47.625 seconds W.; NAD83.

RANGE IN CHARACTERISTICS:

Soil Moisture: An aridic ustic moisture regime. The soil moisture control section is moist in some or all parts for less than 90 consecutive days in normal years. June to August and December to February are the driest months, while September to November and March to May are the wettest months.
Solum thickness: 100 to more than 200 cm (40 to more than 80 in)
Mean annual soil temperature: 22 to 24 degrees C (72 to 76 degrees F)
Exchangeable sodium percentage: 15 or more in some part of the upper 76 cm (30 in)

A and AB Horizons
Hue: 10YR, 7.5YR, and 5YR
Values: 4 through 6
Chroma: 2 through 4
Texture: clay
Clay content: 40 to 60 percent
Electrical conductivity (A horizon): 0.5 to 4 ds/m
Electrical conductivity (AB horizon): 2 to 12 ds/m
Reaction: mildly alkaline or moderately alkaline

B and BC Horizons
Hue: 7.5YR and 5YR
Value: 4 through 6
Chroma: 2 through 4
Texture: clay
Clay content: 40 to 60 percent
B horizon streaks: few to many, colors of the A and AB horizons
Identifiable secondary salt: few to many, threads and crystals
Electrical conductivity: 4 to 16 ds/m, increasing with depth
Reaction: mildly alkaline or moderately alkaline

C horizon (where present)
Texture: clay, clay intermingled with soft claystone masses or claystone bedrock.
Identifiable salt: few to many salt crystals and threads
In some pedons, the soft shale is interbedded with sandstone bedrock
The soft shale slakes in water

COMPETING SERIES: These are the Cotulla series. Similar soils are the Catarina, Harlingen, Montell, Monteola, Reap, Stamford, Tobosa, Victine, and Victoria series.
Catarina soils: are drier in their moisture control sections and have cracks that remain open for longer periods
Cotulla soils: have dominant soil colors in hues of 10YR or more yellow
Harlingen soils: have control sections with over 60 percent clay
Montell, Monteola, Victine, and Victoria soils: have chroma of 1.5 or less in at least the upper 30 cm (12 in)
Reap soils: have soil temperatures less than 22 degrees C (72 degrees F) and less than 15 percent exchangeable sodium
Stamford soils: have soil temperatures less than 22 degrees C (72 degrees F) and less than 15 percent exchangeable sodium
Tobosa soils: have soil temperatures less than 22 degrees C (72 degrees F) and less than 15 percent exchangeable sodium

GEOGRAPHIC SETTING:
Parent material: thick beds of calcareous, saline, clayey sediments; in places, these sediments are interbedded with claystone and sandstone
Landscape: inland, dissected coastal plain
Landform: interfluves
Slope: 0 to 3 percent
Mean annual air temperature range: 21 to 23 degrees C (70 degrees to 74 degrees F)
Mean annual precipitation range: 483 to 660 mm (19 to 26 in)
Frost-free period: 2560 to 300 days
Elevation: 76 to 229 m (250 to 750 ft)
Thornthwaite annual P-E indices: 27 to 32

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chacon, Montell, Monteola and Pryor series.
Chacon series: occur on similar surfaces and have argillic horizons
Montelland and Monteola series: occur on similar surfaces and have chroma of 1.5 or less in at least the upper 30 cm (12 in)
Pryor series: occur on similar surfaces; have argillic horizons; are moderately deep

DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is slow to medium. Permeability is very slow.

USE AND VEGETATION: Used mostly as rangeland, however, a few cultivated areas occur. Grain sorghum, small grain, and perennial introduced grasses are grown in the cultivated areas. Native vegetation includes grasses such as curly mesquite grass, plains bristlegrass, lovegrass tridens, pink pappusgrass, white tridens and threeawn. Woody plants include running mesquite, upright mesquite, twisted acacia, lotebush, condalia, guyacan, spiny hackberry, prickley pear cactus, and dwarf screwbean.

DISTRIBUTION AND EXTENT: LRR I; Western Rio Grande Plain, Texas; LRR I; MLRA 83B; moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: La Salle County, Texas; 1978. The name is coined from the county's name.

REMARKS: These soils were formerly included in the Viboras series. The series was separated based on it is more moist and will support nonirrigated crops. This soil would have been classified in the Grumusol great soil group.

Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon: 0 to 24 inches.

Vertic features: The presence of slickensides and wedge-shaped aggregates at 61 to 183 cm (24 to 72 in). (Bnyssz1, Bnyssz2, BCnyssz horizons)

ADDITIONAL DATA: Local lab data available pedons from McMullen County.

TAXONOMIC VERSION: Keys to Soil Taxonomy, Eleventh Edition 2010

National Cooperative Soil Survey
U.S.A.